The heart, the blood vessels, lymphatic system (or defense system), and the blood are the four main parts of the circulatory system.
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Answer:
D. Two operons regulate gene control in E. coli.
Explanation:
Answer:
Na+ only
Explanation:
Depolarisation of membrane refers to the change in the resting membrane potential of the membrane of a cell which is usually -70mv to a more positive value.
This value changes when the positive ions move inside the cell which increases the positive charge inside the cell.
In the myocardial cell, the sodium ions move inside the cell which changes the potential towards the more positive side as a result of which the signals for contraction arises.
Thus, Na+ only is correct.
D. Nancy Pelosi became speaker when the 4110th Congress convened on January 4, 2007